Single-phase phosphors that emit broadband white-light are needed for white-light-emitting diodes (wLEDs) to reach their full potential. However, it is challenging achieve broad emission from single-phase materials. Consequently, polycrystalline inorganic bulk compounds sans doping rare. We report on a well-known garnet compound, i.e., yttrium iron (YIG), without activator-ion doping. Upon near...